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10. Other Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Other Income and Expenses [Abstract]  
Schedule of other income (expense), net
Other (income) expense, net includes the following components (in millions):
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
 
 
 
 
 
 
 
Interest and investment income
 
$
(30.5
)
 
$
(26.6
)
 
$
(19.1
)
Net realized gains on investments
 
(1.5
)
 
(1.6
)
 
(0.1
)
Other-than-temporary impairment losses on investments
 
5.8

 
0.8

 
7.0

Gain on sale of land
 
—

 
(4.1
)
 
—

Gain on divestiture of a product line
 
—

 
(5.1
)
 
—

Other expense
 
0.1

 
—

 
1.5

Other (income) expense, net
 
$
(26.1
)
 
$
(36.6
)
 
$
(10.7
)